gibson



W. A. GIBSON.

' HYDRAULIC ELBVATOR.

(No Model.)

Patented July 26, 1887.

N4 PEYERS, Phnm-Lnhngmpher. wnshngmn. D. C.

UNITED STATES PATENT OFFICE.

WILLIAM AUG. GIBSON, OE OLDY JEwEY, LONDON, ENGLAND.

HYDRAULIC ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 367,098, dated July 26, 1887.

Application filed January 7, 1886. Serial No. 187,916. (No model.)

To @ZZ whom it may concern:

Be 4it known that I WILLIAM AUGUSTUS GIBsON, a citizen of the United States, residing at Old Jewry, in the city of London, England, have invented a new and useful Improvement iu and connected with Hydraulic Elevators, of which the following is a specification.

This invention relates to hydraulic lifts or elevators such as are now in ordinary use and in which the travel of the cage is governed by -cylinder and the improved constructions in connection therewith; Fig. 2, a detail section of the ordinary eduction-valve, and Fig. 3 a detail section through the valve controlling the supply from the source of power.

A is what may be called the lift-cylinder, as in it travels the piston B, the rods b of which carry the pulleys around which the cage-ropes pass.

C represents the ordinary circulating-pipe used in what are known as the ,Standard Otis,77 or Hale elevators, and through which the water above piston B passes to'the cylinder A,.beneath said piston, as it rises in` pipe c,with a cylinder, F, provided with a pis- .ton, G, the rod g of which works in a second cylinder, H, of smaller size, which is in direct communication with the high-pressure supply through pipe h.

Vthrough the pipe e, into the elevator-cylinder The cylinder F is supplied with water from an overhead tank or cistern, I, lthe communicatinglpipe between them being governed by a check-valve, z'. The supply to this cistern I is from cylinder A, beneath pistou B, which, as it descends, forces the water beneath it through valve E and pipe J.

It will be understood that pipe cis provided with a check-valve, k, while pipe D is provided with a valve which may be operated by hand or from the cage should the high-pressure ever give out; but unless this Occurs it is not used. The supply and discharge through pipe h is also governed by a valve, Z, actuated by the ordinary hand-rope, either direct or by means of its connection with E, as shown. The

capacity of cylinders A and F should be about equal, so that the displacement from F will be sufficient to force piston B to the bottom of cylinder A. while piston g is so proportioned with regard to the known pressure supplied through h as to give the desired pressure in cylinder H. vided with a suitable stuffing-box, m, for piston g to work through, itis not necessary that cylinder F should be closed at the bottom.

The various parts being in the position rcp resented and the apparatus ready to work, the operation is as follows, it being iirst stated that the valve E is open, as between the circulating-pipe C and cylinder A, and valve Z is open, as between cylinder H and dischargepipe h o. The hand-rope is moved and closes valve E, as between the circulating-pipe C and the bottom of cylinder A, which it opens to pipe J and cistern I. At the same time valve Z is closed, as between H 7i o, and opened as to h h H, by which the water under high pressure is admitted to cylinder H. The water at high pressure causes the piston or ram g in the cylinder H to rise, and consequently the piston G eXpels the water in cylinder F,

A, thereby forcing the elevator-piston B downward, the water underneath the elevatorpiston B being discharged into the tank I, as before described. Vhen the piston G in cylinder F is rising, the water is prevented from passing back into the tank I by the checkvalve i, and thus the water is compelled tomove through c into A. When it is desired that the piston B should rise, the hand-rope The top of cylinder H being pro- IOO is again moved, and the valves E and Z brought to their former position, the pressure being thereby removed from under g and the valve E opened between C and A, thus equalizing the pressure on both sides of the piston B. The weight of the cage will then cause said piston to risc through the solid body ol` water. The water above it being prevented from passing back to cylinder F, by means of checkvalve 1:, is compelled to pass through the circulating-pipe C to the under side ofsaid piston. W'hile this is taking place the high-pressure water from cylinder H has been discharged through pipes h` o, and piston f/ descends in said cylinder, bringing with it piston G in cylinder F, which is kept filled, as the piston G descends, by the water which Ilowsin from tank I through valve z'.

ltwill be seen by the combination of parts described that the large volume of water requi red to fill the cylinder A is supplied at a moderate pressure from the cylinder F, while the amount of high-pressure water required to effect this operation is only equal to the capacity of the small cylinder H. It will also be seen that the large volume of water discharged from the large cylinder A is utilized for again supplying the cylinder A. ln fact the large volume of water is simply circulated and never actually discharged, the only waste of water being that discharged from the descent of the piston in the small cylinder H, so that the apparatus is available for effective use where the water can be had in limited volunies, but at high pressure, and where an extended movement ofthe elevating-piston B is required. An important feature in this connection is that should the source of water at high power be cut off, the apparatus can still be worked from the overhead supply or other source of supply at ordinarypressure, when such a supply is available.

\Vhat I claim, and desire and desire to sccure by Letters Patent, is-

l. The combination, with thelifting-eylindcr and piston, circulating pipe, and valve of a hydraulic elevator, of a cylinder, F, containing a poweractuatcd piston and connections between the cylinder F and the bottom and top of thelifting-cylinder, whereby the water discharged from the bottom of the lifting-cylinder is subsequently forced into the top thereof, substantially as described.

2. The combination, with the liftingeylinder, circulating-pipe, inlet and discharge pipes, and valve of a hydraulic elevator, ofthe cylinders F and H of different diameters, provided with connected pistons, the tank ]`,com municating with the discharge-pipe of the lifting-cylinder and with the cylinder F, the higlrpressure inlet-pipe communicating with the small cylinder H, and the discharge-pipe of the cylinder lI, substantially as described.

8. The combination, with thc lifting-cylinder, its inlet, outlet, and circulating pipes and valves, of the cylinders F and H of different diametcrs, having connected pistons and valve Z, controlling the low of iluid to and from the small cylinder H, the tank l, communicating with the discharge-port of the liflingeylinder and with the cylinder F, and connections between the two valves, whereby they are caused to turn together, substantially as described.

In testimony whereof I have heren nto signed my name in the presence of the two subscribing witnesses.

XVM. AUG. GIBSON.

Witnesses:

FRED Porn, ARTHUR L. GinsoN. 

